Extensible "Create Project" project type list

I have a request similar to #713, but more generic: that the Create Project list of project types could be extensible - and other extensions could contribute to it. Adding explicitly project types with their extension IDs and commands centrally into vscode-java-dependency does not scale well, as many extensions that support a certain technology could offer preconfigured java project templates, or "wizards" to create boilerplate projects.
In the long run, opening integration in the Create Java Project can offer a smooth user experience.

The same data as with the current hardcoded list could be contributed through package.json by other extensions: extension ID, label and command ID, and the Java Dependency extension would then define argument(s) that will be passed to the creation command (if any).

Inizia individuando l’attuale elenco codificato dei tipi di Create Java Project e verificando in che modo package.json contribuisce ai metadati delle estensioni. Definisci i dati di contribuzione per l’ID dell’estensione, l’etichetta, l’ID del comando e gli argomenti facoltativi, quindi verifica che un’altra estensione possa fornire un tipo di progetto e che l’elenco Create Project lo invochi correttamente.